<template>
    <div class="goods">
       <div class="menu-wrapper" ref="menuWrapper">
         <ul>
           <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index, $event)">
             <span class="text">
               <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
             </span>
           </li>
         </ul>
       </div>
       <div class="foods-wrapper" ref="foodsWrapper">
         <ul>
           <li v-for="item in goods" class="food-list food-list-hook">
             <h1 class="title">{{item.name}}</h1>
             <ul>
               <li v-for="food in item.foods" class="food-item">
                 <div class="icon">
                   <img :src="food.icon" width="57" height="57">
                 </div>
                 <div class="content">
                   <h2 class="name">{{food.name}}</h2>
                   <p class="desc">{{food.description}}</p>
                   <div class="extra">
                     <span class="count">月售{{food.sellCount}}份</span>
                     <span>好评率{{food.rating}}%</span>
                   </div>
                   <div class="price">
                     <span class="now">￥{{food.price}}</span>
                     <span v-show="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
                   </div>
                   <div class="cartcontorl-wrapper">
                      <cartcontrol :food="food"></cartcontrol>
                   </div>
                 </div>
               </li>
             </ul>
           </li>
         </ul>
       </div>
       <shopcart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
    </div>
</template>

<script>
import BScroll from 'better-scroll';
import shopcart from 'components/shopcart/shopcart';
import cartcontrol from 'components/cartcontrol/cartcontrol';
const ERR_OK = 0;
export default {
  props: {
    seller: {
      type: Object
    }
  },
  data() {
    return {
      goods: {},
      listHeight: [],
      scrollY: 0
    };
  },
  computed: {
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i + 1];
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i;
        }
      }
      return 0;
    },
    selectFoods() {
      let foods = [];
      for (let i in this.goods) {
        for (let j in this.goods[i].foods) {
          if (this.goods[i].foods[j].count) {
            foods.push(this.goods[i].foods[j]);
          }
        }
      }
      return foods;
    }
  },
  created() {
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
    this.$http.get('/api/goods').then((response) => {
      var data = response.body;
      console.log(response.body);
      if (data.errno === ERR_OK) {
        this.goods = data.data;
        this.$nextTick(() => {
           this._initScroll();
           this._calculateHeight();
        });
      }
    });
    console.info(this);
  },
  components: {
    shopcart,
    cartcontrol
  },
  methods: {
    _initScroll() {
      this.meunScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      });
      this.foodScroll = new BScroll(this.$refs.foodsWrapper, {
        click: true,
        probeType: 3
      });
      this.foodScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    _calculateHeight() {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          let item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
    },
    selectMenu(index, event) {
      if (!event._constructed) {
        return;
      }
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
      let el = foodList[index];
      console.info(index);
      this.foodScroll.scrollToElement(el, 300);
    }
  }
};
</script>
<style lang="less"  rel="stylesheet/less" type="text/less">
 @import '../../common/less/icon.less';
 @import '../../common/less/mixin.less';
  .goods {
    display: flex;
    position: absolute;
    top: 174px;
    bottom: 46px;
    width: 100%;
    overflow: hidden;
    .menu-wrapper {
      flex: 0 0 80px;
      width: 80px;
      background: #f3f5f7;
      .menu-item {
        display: table;
        height: 54px;
        width: 56px;
        margin: 0 auto;
        padding: 0 12px;
        line-height: 14px;
        &.current {
          position: relative;
          z-index: 10;
          margin-top: -1px;
          background: #fff;
          font-weight: 700;
          .text {
            .border-none();
          }
        }
        .icon {
          display: inline-block;
          width: 12px;
          height: 12px;
          vertical-align: top;
          margin-right: 2px;
          background-size: 12px 12px;
          background-repeat: no-repeat;
          &.decrease {
            background-image: url('decrease_3@2x.png');
            @media(-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
             background-image: url('decrease_3@3x.png');
            }
          }
          &.discount {
            background-image: url('discount_3@2x.png');
            @media(-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
             background-image: url('discount_3@3x.png');
            }
          }
          &.guarantee {
            background-image: url('guarantee_3@2x.png');
            @media(-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
             background-image: url('guarantee_3@3x.png');
            }
          }
          &.invoice {
            background-image: url('invoice_3@2x.png');
            @media(-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
             background-image: url('invoice_3@3x.png');
            }
          }
          &.special {
            background-image: url('special_3@2x.png');
            @media(-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
             background-image: url('special_3@3x.png');
            }
          }
        }
        .text {
            display: table-cell;
            width: 56px;
            vertical-align: middle;
            .border-1px(rgba(7,17,27,0.1));
        }
    }
  }
    .foods-wrapper {
      flex: 1;
      .title {
        padding-left: 14px;
        height: 26px;
        line-height: 26px;
        border-left: 2px solid #d9dde1;
        font-size: 12px;
        color: rgb(147,153,159);
        background: #f3f5f7;
      }
      .food-item {
        display: flex;
        margin: 18px;
        padding-bottom: 18px;
        .border-1px(rgba(7,17,27,0.1));
        &:last-child {
          .border-none();
          margin-bottom: 0;
        }
        .icon {
          flex: 0 0 57px;
          margin-right: 10px;
        }
        .content {
          flex: 1;
          .name {
            margin: 2px 0 8px 0;
            height: 14px;
            line-height: 14px;
            font-size: 14px;
            color: rgb(7,17,27);
          }
          .desc,.extra  {
            line-height: 10px;
            font-size: 10px;
            color: rgb(147,153,159);
          }
          .desc {
            margin-bottom: 8px;
            line-height: 12px;
          }
          .extra {
           count {
            margin-right: 12px;
           }
          }
          .price {
            // display: inline-block;
            font-weight: 700;
            line-height: 24px;
            .now {
              margin-right: 8px;
              font-size: 14px;
              color: rgb(240,20,20);
            }
            .old {
              text-decoration: line-through;
              font-size: 10px;
              color: rgb(147,153,159);
            }
          }
          .cartcontorl-wrapper {
            position: absolute;
            right: 0;
            bottom: 12px;
          }
        }
      }
    }
  }
</style>